Spinning bucket



Julyfls, 1935I c@ J. QUANTIN 2,008,037

SPINNING BUCKET Filed June 10, 1951 ,les

x l I Inverdfor Patented July 16,- 1935 SPINNING BUCKET Charles-JulesQuantin, Paris, France, assignor to Du Pont Rayon Company, New York, N.Y., a corporation of Delaware v ApplicationJune 10, 1931, Serial No.543,252 In France September 20, 1930 9 Claims.

- This invention relates tol the manufacture of artificial threads. Moreparticularly the invention relates to the manufacture of artificialthreads from viscose; cuprammonium cellulose V' 5 or the like whereinthe thread is collected in revolving buckets.

In the bucket-spinningmethod of manufacturing artificial thread thethread is collected in buckets which revolve at high speeds. Thesebuckets are often moldedA from materials such as synthetic resin, whichresists the action -of the liquids with which the thread has beentreated. Such molded buckets, however, lack the strength tov stand highrotational speeds. Buckets are also made of metals or of metal alloys.`'I'hese buckets stand the high speeds of rotation but are corroded bythe chemical action of the liquids carried by the thread. Attempts havebeen made to reinforce the molded buckets with metalsor to line themetal buckets with an acid-resistant material but 4these attempts havenot been accompanied with satisfactory results.v f

' Where 'the molded bucket has been reinforced with metallic hoopsforthe line, or whereA it has been reinforced by inserting metal bands orother reinforcements in the cast material, it has not been possible tosecure either dynamic balance or suiciently good adherence between metaland molded portion to prevent the separation of the molded material fromthe metal, and the subsequent cracking or breaking oil of portions ofthe molded material.

4Where an acid-resistant lining is provided foran improved bucket forthe manufacture of artiiicial thread. Another object is to manufactureartificial thread at higher bucket speeds. Other objects of theinvention will be in part apparent and in part set forth in thespecification.

The objects of this invention are accomplished by molding or otherwiseforming the body of the bucket from a material resistant to chemicalaction, and by sheathing the portions of the bucket subject to burstingstresses in a. material, capable of great resistance to disintegrationby centrifugal forces, `which holds the molded portions of the bucketunder compression.

In the drawing, Figure 1 is a cross-sectional view of a bucket made.according to my invention; Figure 2 is a second form of `bucketembodying my invention; Figure 3 discloses yet .another form of bucketembodying my invention.

In Figure 1, I indicates the molded, chemically inert portion, of abucket made in `accordance `with my invention; 2 indicates a metallicsheathing which is applied to portion I of the bucket under tension soas Vto surround and reinforce the surfaces of the bucket which aresubject to bursting stresses; II indicates the portion of the 15 bucketdesigned in any customary manner to be attached to the rotatingmechanism of the manufacturing machine as by means of opening I6; I3 isan annular ledge circumscribing the upper portion of the bucket; 3 is abucket cover resting -r upon the ledge I3; I4 is an undercut annuluswith which annular spring ring '4 engages to keep the cover 3 inposition; 4I is one end of the spring 4 turned up to provide theoperator of the machine with a means of compressing the spring towithdraw it from its lockingrelation with annulus I4; I2 are small holesthrough the -wall of the bucket through which the thread liquids escape.

In Figure 2 is shown a form of bucket similar to that of Figure 1 exceptthatthe bucket has no cover and that the shape of the walls is somewhatdiiierent.

In Figure 3 is shown a` modified form of bucket in which I indicates themolded section of the bucket; I I and I8 indicate the means for attach-'ing the bucket to the rotating mechanism of the order to permit easywithdrawal of the bucket walls are preferably somewhat farther apart atthe top than at the bottom to provide for easy withdrawal of the bucketcake.

It is my discovery that, if higher bucket speeds are to be attained,buckets must be reinforced with a. material which is capable ofwithstanding the bursting stresses of the resistant molded material andwhich must be held in such intimate contact with the molded materialthat no shifting or independent strains are set up in that material. Inorder to secure this eiIect it is necessary to reinforce the outside ofthe bucket throughout with a shell of suitable material such as aluminumalloys or steel. An aluminum alloy suitable for my purpose, although itwill be understood that other aluminum reinforcements can also be used,contains about 1.25% magnesium and about 1% silica. If a steel skirt isused, it may be advantageously of austenitic structure containing aslight proportion of molybdenum and copper. l

'I'he skirt or reinforcement should be applied ln a manner to keep themolded interior of the bucket always under compression. This isadvantageously accomplished by winding with wire under tension. Where asteel skirt is used, a skirt should be formed` having the same shape asthe molded bucket but of diameter insufficiently great in the cold to goover the bucket. This skirt may then be heated until it expandssulciently to go over the bucket after which it is put in place over thebucket and allowed to shrink, holding the bucket with the force ofcontraction.

The term shell, as used in this specification, means a shell whichsubstantially completely covers the outer wall of the liner;

An advantage of this invention is the ability to manufacture artificialthread at higher bucket speeds than are normally used at the presenttime, buckets of this construction being capable of sustaining a speedof 10,000 revolutions per minute. Another advantage is in the protectionagainst chipping which is offered the outer surface oi' the moldedbucket. Another advantage is in the formation of buckets having bothgreat strength and high resistance to the chemical action of the fluidsused in the preparation of articial thread. `Other advantages of theinvention will be apparent.

As many apparently widely different embodiments of this invention may bemade without departing from the spirit and scope thereof, it is to beunderstood that I do not limit myself to the specic embodiments thereofexcept as defined in the appended claims.

I claim:

1.V In a spinning bucket resinous means resistant to chemical action forholding thread and means for reinforcing and compressing the first saidmeans so that spinning speeds higher than normal may be attained.

2. In a spinning bucket a thread holder held in a state of compressionby a surrounding metallic sheath.

3. In a spinning bucket a synthetic resin thread holder held in a stateof vcompression by a surrounding metallic sheath.

4. In a spinning bucket a synthetic resin thread holder held in a stateof compression by a surrounding ferrous sheath.

5. In a spinning bucket a synthetic resin thread holder held in a stateof compression by a surrounding aluminous sheath.

6. In a spinning bucket a thread holder of synthetic resin resistant tothe action of treating liquids, surrounded and held under compression bya wound-wire reinforcement.

7. A centrifugal bucket comprising a metallic shell holding incompression a chemically inert liner.

' 8. A centrifugal bucket comprising a shell highly resistant to thebursting stresses -set up by rapid rotation holding in compression achemically inert liner.

9. A centrifugal bucket comprising a strong sheath having highresistance to expansion at high speeds of rotation, holding incompression a liner resistant to the action of uids used in themanufacture of regenerated cellulose.

CHARLES-JULES QUANTIN.

